Cynan Meiriadog of Brittany

Cynan Meiriadog of Brittany (290-387), also known as Conan the Merry, was the first king of Brittany, reigning from the 4th century until his death in 387 at the age of 97. He was succeeded by Aldroenus as King of Brittany. He was also the first King of Cornwall, reigning until 387, when his son Cadfan succeeded him.

Biography
Cynan Meiriadog was born in 290, the son of Geraint ap Einudd and the grandson of King Einudd of Deheubarth in southern Wales. Cynan "Meiriadog" (also translated as Conan "the Merry") was of Welsh descent, and he was the nephew of Eudaf Hen, King of the Britons. When the throne was offered to Magnus Maximus, Cynan at first opposed him, but when Maximus married Eudaf's daughter, Cynan was reconciled with him. When Maximus led the armies of Roman Britain to conquer Rome, he conquered Armorica, where he instructed Cynan to found another Britain. Cynan defended Armorica from numerous attacks by the Gauls and Aquitanians, and when Maximus was killed in Rome, his fleeing troops returned to Armorica and joined Cynan's settlement. He reigned as the king of Armorica, later to become known as "Brittany", until his death at the age of 97 in 387. His son Cadfan ap Cynan would go on to become the king of Cornwall back in the British Isles, while another line of his family ruled Brittany for centuries, with "Conan" becoming a popular Breton name.